This move can only be performed by a serious stud. The girl you are doing needs to be completely mesmerized that she doesn't even know what's going on. Then you carefully slide your dick out and in her vagina you shove a condom full of fireworks. Light those babies before she realizes and you my friend will have performed the snap crackle vagina.

Just as Cindy thought Johnny was about to say I love you, he shoved a condom full of fireworks into her vagina, and lit them up.
"Haha bitch yo ass has just experienced the snap crackle vagina"